Case:
Our iOS app offers selling of custom made recipe packages that would be created for each user specifically. For example - user buys package of rec
If you get paid using Apple services (in-app purchases) then NO, it isn't possible for an Apple Developer (business or individual) to refund App Store customers.
The only option is to direct customers to iTunes Store Customer Support as officially stated in the iTunes Connect screenshot below:
To increase the chances for your customers in getting refunded you could provide them with an e-mail stating that you would like them to receive a refund which they could show to the iTunes Support employee.
As a colleague stated, an option would be to use an external payment processor like PayPal which would allow you to manage refunds, but I think this will greatly increase the work needed since you will need to manage almost everything regarding payments on your own.
Also note that this option is highly restricted by Apple to only physical services or goods and sometimes Apple does not approve apps providing services through third-party payment processors. So.. you should be very careful what path you choose to take.
If the recipes you're providing to your customers are in digital format and users receive them in your app, you can be 100% sure that Apple will force you to use the in-app purchase system.